BA 35203_04 * 3.0 * 35203_04_07_Wartung.fm 7-87
Maintenance 7
Urea solution
Important information about the urea solution
Health risk from urea solutions!
Urea solutions and their vapors are harmful to health! Incorrect handling
can cause injuries.
► Avoid contact with the skin, eyes and mouth.
► Ensure good ventilation.
► Ensure cleanliness.
► Wear protective equipment.
► Seek medical attention immediately in case of accidents with urea
solutions.
Urea is a highly pure, watery 32.5% solution that is use as a NOx reducing
agent for SCR exhaust fume after-treatment (SCR = selective catalytic
reduction) of motor vehicles with diesel engines.
• The product must correspond to DIN 70070, ISO 22241-1 or
ATSTM D 7821.
• The service life of urea solutions without a loss of quality is influenced
by the storage conditions.
The urea solution crystallizes (freezes) at -11°C (12.2°F) and over
+35°C (95°F) a hydrolysis reaction sets in. This means a slow
decomposition into ammonia and carbon dioxide begins.
• Avoid direct sunlight on unprotected storage containers.
• Containers with a urea content may not be stored for more than one
year.
• Urea solution freezes from -11°C (12.2°F) ambient temperature.
For ambient temperatures below -11°C (12.2°F), a preheating of the
SCR system is therefore necessary.
• The urea solution should remain in the tank for a maximum of 4
months. This is to be documented.
• Empty and clean the urea tank when at a standstill.
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